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## User Model
Add the `CanPay` trait and `Customer` interface to your User model.
> The trait `CanPay` already inherits `HasWallet`, reuse will cause an error.
```php
use Bavix\Wallet\Traits\CanPay;
use Bavix\Wallet\Interfaces\Customer;
class User extends Model implements Customer
{
use CanPay;
}
```
## Item Model
Add the `HasWallet` trait and `Product` interface to Item model.
```php
use Bavix\Wallet\Traits\HasWallet;
use Bavix\Wallet\Interfaces\Product;
use Bavix\Wallet\Interfaces\Customer;
class Item extends Model implements Product
{
use HasWallet;
public function canBuy(Customer $customer, int $quantity = 1, bool $force = null): bool
{
/**
* If the service can be purchased once, then
* return !$customer->paid($this);
*/
return true;
}
public function getAmountProduct(Customer $customer)
{
return 100;
}
public function getMetaProduct(): ?array
{
return [
'title' => $this->title,
'description' => 'Purchase of Product #' . $this->id,
];
}
public function getUniqueId(): string
{
return (string)$this->getKey();
}
}
```
## Proceed to purchase
Find the user and check the balance.
```php
$user = User::first();
$user->balance; // int(100)
```
Find the goods and check the cost.
```php
$item = Item::first();
$item->getAmountProduct($user); // int(100)
```
The user can buy a product, buy...
```php
$user->pay($item);
$user->balance; // int(0)
```
What happens if the user does not have the funds?
The same as with the [withdrawal](withdraw#failed).
```php
$user->balance; // int(0)
$user->pay($item);
// throw an exception
```
The question arises, how do you know that the product is purchased?
```php
(bool)$user->paid($item); // bool(true)
```
## Safe Pay
To not write `try` and `catch` use `safePay` method.
```php
if ($user->safePay($item)) {
// try to buy again )
}
```
It worked!